It is believed that when the veins in the testes get engorged with blood and the temperature of the scrotum increases. When the temperature of the scrotum increases, the sperms are damaged and hence sterility results. In males who have varicoceles and sterility, both a decrease in number and structural defects of sperm have been seen. However, sterility does not occur in all men who have varicoceles. Millions of men with varicoceles have gone on to have successful families.
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